IOmeter Cache only benchmark performance

James_Sillett — Thu, 05 Jun 2025 05:19:19 GMT

Dear All
I am looking for some feedback regarding benchmark testing on our new Netapp FAS2552 running 8.2RC17 Mode 7 with Vmware using Iscsi

I have connected the Netapp to Vmware ESXi 5.5 with a 10gb connection from the SAN to the switch and from the switch to the host. I set up iometre to test using using 4k blocks in sequential reads with outstanding IOPs at 16. I have limited the sample size 100mb, this effectively is making a cache run from the SAN and I have confirmed the read has 100% hit rate.
. I am surprised to see that the maximum number of iop,s is only 20,000 with less than 90 MB-s being utilised. I would have thought if the Netapp was serving 100% from cache memory the iop,s level would be significantly higher.
I have also benchmarked against a LUN from the Netapp directly into the Windows 2008 OS using the software initiator within the Windows operating system. I am seeing very similar performance. Given the fact that everything is being served from cache, does it seem right for iop,s at this level? Your thoughts would be greatly appreciated.

topic IOmeter Cache only benchmark performance in ONTAP Discussions

IOmeter Cache only benchmark performance